200 	struct cow_header_v3 *header;  in write_cow_header()  local
211 	header = cow_malloc(sizeof(*header));  in write_cow_header()
212 	if (header == NULL) {  in write_cow_header()
217 	header->magic = htobe32(COW_MAGIC);  in write_cow_header()
218 	header->version = htobe32(COW_VERSION);  in write_cow_header()
221 	if (strlen(backing_file) > sizeof(header->backing_file) - 1) {  in write_cow_header()
225 			   sizeof(header->backing_file) - 1);  in write_cow_header()
229 	if (absolutize(header->backing_file, sizeof(header->backing_file),  in write_cow_header()
233 	err = os_file_modtime(header->backing_file, &modtime);  in write_cow_header()
236 			   "request failed, err = %d\n", header->backing_file,  in write_cow_header()
241 	err = cow_file_size(header->backing_file, size);  in write_cow_header()
245 			   header->backing_file, -err);  in write_cow_header()
249 	header->mtime = htobe32(modtime);  in write_cow_header()
250 	header->size = htobe64(*size);  in write_cow_header()
251 	header->sectorsize = htobe32(sectorsize);  in write_cow_header()
252 	header->alignment = htobe32(alignment);  in write_cow_header()
253 	header->cow_format = COW_BITMAP;  in write_cow_header()
255 	err = cow_write_file(fd, header, sizeof(*header));  in write_cow_header()
256 	if (err != sizeof(*header)) {  in write_cow_header()
264 	cow_free(header);  in write_cow_header()
284 	union cow_header *header;  in read_cow_header()  local
289 	header = cow_malloc(sizeof(*header));  in read_cow_header()
290 	if (header == NULL) {  in read_cow_header()
295 	n = (*reader)(0, (char *) header, sizeof(*header), arg);  in read_cow_header()
296 	if (n < offsetof(typeof(header->v1), backing_file)) {  in read_cow_header()
301 	magic = header->v1.magic;  in read_cow_header()
303 		version = header->v1.version;  in read_cow_header()
305 		version = be32toh(header->v1.version);  in read_cow_header()
312 		if (n < sizeof(header->v1)) {  in read_cow_header()
317 		*mtime_out = header->v1.mtime;  in read_cow_header()
318 		*size_out = header->v1.size;  in read_cow_header()
319 		*sectorsize_out = header->v1.sectorsize;  in read_cow_header()
320 		*bitmap_offset_out = sizeof(header->v1);  in read_cow_header()
322 		file = header->v1.backing_file;  in read_cow_header()
325 		if (n < sizeof(header->v2)) {  in read_cow_header()
330 		*mtime_out = be32toh(header->v2.mtime);  in read_cow_header()
331 		*size_out = be64toh(header->v2.size);  in read_cow_header()
332 		*sectorsize_out = be32toh(header->v2.sectorsize);  in read_cow_header()
333 		*bitmap_offset_out = sizeof(header->v2);  in read_cow_header()
335 		file = header->v2.backing_file;  in read_cow_header()
338 	else if (version == 3 && (*((int*)header->v3.backing_file) != 0)) {  in read_cow_header()
339 		if (n < sizeof(header->v3)) {  in read_cow_header()
344 		*mtime_out = be32toh(header->v3.mtime);  in read_cow_header()
345 		*size_out = be64toh(header->v3.size);  in read_cow_header()
346 		*sectorsize_out = be32toh(header->v3.sectorsize);  in read_cow_header()
347 		*align_out = be32toh(header->v3.alignment);  in read_cow_header()
352 		*bitmap_offset_out = ROUND_UP(sizeof(header->v3), *align_out);  in read_cow_header()
353 		file = header->v3.backing_file;  in read_cow_header()
359 		if (n < sizeof(header->v3_b)) {  in read_cow_header()
374 		*mtime_out = (time32_t) be32toh(header->v3_b.mtime);  in read_cow_header()
376 		*size_out = be64toh(header->v3_b.size);  in read_cow_header()
377 		*sectorsize_out = be32toh(header->v3_b.sectorsize);  in read_cow_header()
378 		*align_out = be32toh(header->v3_b.alignment);  in read_cow_header()
383 		*bitmap_offset_out = ROUND_UP(sizeof(header->v3_b), *align_out);  in read_cow_header()
384 		file = header->v3_b.backing_file;  in read_cow_header()
399 	cow_free(header);  in read_cow_header()